Refractometer



FIG. 1 is a perspective view of a refractometer.

FIG. 2 is a right side elevational view of the invention.

FIG. 3 is a left side elevational view of the invention.

FIG. 4 is a top plan view of the invention.

FIG. 5 is a bottom plan view of the invention.

FIG. 6 is a front elevational view of the invention; and,

FIG. 7 is a rear elevational view of the invention. 

The ornamental design for a refractometer, as shown and described. 